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INDONESIA
Jurnal Fisika Unand
Published by Universitas Andalas
ISSN : 23028491     EISSN : 26862433     DOI : https://doi.org/10.25077/jfu
Core Subject : Science, Engineering,
Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics
Makalah yang dapat dipublikasikan dalam jurnal ini adalah makalah dalam bidang Fisika meliputi Fisika Atmosfir, Fisika Bumi, Fisika Intrumentasi, Fisika Material, Fisika Nuklir, Fisika Radiasi, Fisika Komputasi, Fisika Teori, Biofisika, ataupun bidang lain yang masih ada kaitannya dengan ilmu fisika.
Arjuna Subject : Fisika dan Astronomi - Fisika Nuklir dan Molekuler, dan Ooptik
Articles 15 Documents
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Search results for , issue "Vol 14 No 4 (2025)" : 15 Documents clear
Green Synthesis Nanopartikel Tembaga (CuNP) Menggunakan Ekstrak Buah Naga Merah (Hylocereus polyrhizus) sebagai Aplikasi Lapisan Tipis Karim, Afdal; Mardiansyah, Dedi; Dahlan, Dahyunir
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.408-412.2025

Abstract

Copper nanoparticle (CuNP)-based thin films have great potential in various technological applications, such as electronics, catalysts, and sensors, due to their high conductivity value and enhanced surface reactivity. This study aims to fabricate CuNP-based thin films using the spraying method, which is known to be efficient for material deposition on substrates. In the spraying process, copper nanoparticles are sprayed on a transparent glass substrate and dried at room temperature to form a homogeneous thin layer. Characterization of the thin films using UV-Vis spectrophotometer to determine the energy band gap and transmittance value. The results of testing the energy band gap of copper nanoparticles with a ratio of 1, 2, 3, 4, and 5 amounted to 3.03 eV, 3.09 eV, 3.11 eV, 3.17 eV and 3.25 eV. Meanwhile, the transmittance test results show that the percentage of thin layer transmittance ranges from 20% to 90% with good crystal quality and a smaller energy band gap that has high electrical conductivity so that the thin layer produced has a decent quality to be applied to printed electronic devices.
Indonesia Rancang Bangun Alat Ukur Konsentrasi Rhodamin B Menggunakan Sensor TCS34725 Berbasis Arduino UNO pada Kerupuk Bewarna Zakhiah, Putri; Firmawati, Nini
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.401-407.2025

Abstract

Food safety is a critical aspect, particularly regarding the use of hazardous dyes such as Rhodamine B, which can cause liver damage and increase cancer risk if consumed excessively. This study developed a system to detect and measure the concentration of Rhodamine B in red crackers using the TCS34725 sensor. The system utilizes the sensor to measure the colour intensity of samples, which is processed using an Arduino UNO and displayed as RGB values that are converted into Rhodamine B concentrations. The detection results are displayed on an LCD (Liquid Crystal Display) screen and complemented with a buzzer as an alarm. Validation was conducted by comparing the system's measurements with a UV-Vis spectrometer across a wavelength range of 400 nm to 600 nm for 10 Rhodamine B concentration variations, ranging from 0.5 ppm to 5 ppm. Testing was also performed on 10 red cracker samples through an extraction process. The results showed that the system achieved an accuracy of 93.86%, with a maximum wavelength of 553 nm. Two samples were detected to contain Rhodamine B at concentrations of 4.98 ppm and 5.11 ppm, respectively. This system is effective as a practical and accurate tool for ensuring food safety.
Evaluasi Penerapan Proteksi Radiasi pada Ruangan dan Pekerja Radiasi di Instalasi Radiologi Rumah Sakit Universitas Andalas Rahmawati, Indy; Milvita, Dian; Hiswara, Eri
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.394-400.2025

Abstract

Research has been carried out regarding the evaluation of the application of radiation protection to rooms and radiation workers in the Radiology Installation at Andalas University Hospital. The aim of the research is to evaluate the radiation dose rate on the inside and outside walls of the room, evaluate the radiation dose rate received by radiation workers, and evaluate the completeness of the work area and radiation protection for radiation workers. Evaluation of the radiation dose rate on the radiation shield wall was carried out using the TLD-100 in the CT-Scan, conventional X-ray and dental rooms. Evaluation of the radiation dose rate received by radiation workers is carried out using the TLD badge worn by radiation workers. Evaluation of the completeness of the work area is carried out by directly observing the radiology room, then conducting interviews with radiation workers. The research results showed that the highest radiation dose rate was obtained in the CT-Scan room and the lowest was outside the dental room at the entrance, without exceeding the Dose Limit Value (NBD) set by BAPETEN Regulation No. 4 of 2013 of 20 mSv/year for radiation workers and 1 mSv/year for the general public. The radiation dose rate value received by radiation workers is still below the NBD set by BAPETEN Regulation No. 4 of 2013 amounting to 20 mSv/year. The results of the evaluation of the completeness of the work area and radiation protection in general have met the provisions of BAPETEN Regulation No. 4 of 2020 except for danger signs in conventional X-ray and CT-Scan rooms.
Desain Pengiriman Data Gambar Menggunakan Gelombang Cahaya Tampak dengan Sel Surya Sebagai Detektor Cahaya Wahid, Rendy M.; Ariani, Menik; Adnan, Assaidah
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.387-393.2025

Abstract

Visible Light Communication research that sends image data has not been widely published. Therefore, it is necessary to conduct an experiment on sending image data from a camera connected to an Arduino where the module process is run. In this study, image transmission uses pulse-width-modulation (PWM), namely 2-PWM and 4-PWM. On the transmitter side, it consists of an OV2640 camera sensor, laser and Arduino Uno R3 while on the receiver side it consists of a solar panel and Arduino Uno R3. A push button is used as a trigger to take a picture by the camera; the image file will be converted by Arduino into binary; the binary will be modulated by the frequency of the red laser that emits pulses to the solar panel. The solar panel will forward the signal to Arduino to be modulated back into the original binary. Binary data will be processed into image data back offline using a computer. The system can work at a maximum distance of 8 m when using the 2-PWM module technique and a maximum of 6 m when using 4-PWM. The size of the system performance is calculated from the bit-error-ratio (BER) value based on the binary data received at the receiver.
Sintesis Surfaktan Natrium Lignosulfonat (C20H24Na2O10S2) Berbahan Dasar Serbuk Kayu Mahoni Menggunakan Proses Sulfonasi. Maulida, Nabilah; Aisah; Perwitasari, Dyah Suci; Siswati, Nana Dyah; Sani
Jurnal Fisika Unand Vol 14 No 4 (2025)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.25077/jfu.14.4.421-427.2025

Abstract

Furniture production made from mahogany wood produces sawdust that contains biomass such as cellulose, hemicellulose, and lignin. The lignin content in mahogany wood can be used as raw material for making sodium lignosulfonate surfactants. Delignification of lignin is carried out alkaline and continued with lignin isolation by acid precipitation. Pure lignin isolate is further used as a raw material for making sodium lignosulfonate surfactants using the sulfonation process. The sulfonation process is carried out by mixing lignin isolate and sodium bisulfite solution using excess NaHSO3 variation and sulfonation time. Both variables are run by adding sodium hydroxide as a catalyst and the pH condition was maintained at pH 4. The sodium lignosulfonate surfactant solution formed was then characterized using FT-IR spectrophotometer and UV-Vis spectrophotometer. The best condition was obtained at a sulfonation time of 150 minutes and NaHSO3 exceeded 75%, namely with a surfactant concentration of   4100,784 mg/L.

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